b12 injections nhs choices for Energy: Benefits and How It Works B12 Injections for Weight Loss:
Description
doi:10.1111/jth.13741 Prevention

These nutrients help promote satiety to keep you feeling fuller for longer, reducing the likelihood of overeating (13) (14)

& Scherer, P

A vitamin B12 injection is needed after gastric banding when oral supplementation has failed to correct a documented deficiency, serum B12 remains persistently low, the patient cannot adhere to daily oral tablets, or there are signs of neurological or haematological complications
